title: Tryptophan depletion and emotional processing in healthy volunteers at high risk for depression.
abstract: BACKGROUND
  Studies in depressed patients have demonstrated the presence of emotional bias toward negative stimuli, as well as dysregulated brain serotonin function. The present study compared the effects of acute tryptophan depletion (ATD) on both an emotional processing and a planning task in never-depressed healthy volunteers at high and low familial risk for depression.
  
  
  METHODS
  Young adults with no personal psychiatric history were stratified into two groups based on family history (n = 25). Participants were enrolled in a randomized, double-blind, placebo-controlled crossover ATD study and completed the affective go/no-go and Tower of London tasks once during each condition.
  
  
  RESULTS
  There was a significant treatment by valence by group interaction on the affective go/no-go, driven primarily by a greater frequency of inappropriate responses to sad than to happy distracters in the high-risk group during ATD. No group differences were observed on the Tower of London.
  
  
  CONCLUSIONS
  Asymptomatic individuals at high familial risk for depression showed abnormalities in emotional processing while undergoing experimentally induced tryptophan depletion. These findings support emotional processing disturbances as potential trait-level abnormalities associated with the risk of mood disorder.
authors.affiliation: Department of Psychiatry, Mount Sinai School of Medicine, New York, New York 10029, USA. adriana.feder@mssm.edu
authors.forename: Adriana
authors.initials: A
authors.lastname: Feder
authors.forename: Jamie
authors.initials: J
authors.lastname: Skipper
authors.forename: James R
authors.initials: JR
authors.lastname: Blair
authors.forename: Katherine
authors.initials: K
authors.lastname: Buchholz
authors.forename: Sanjay J
authors.initials: SJ
authors.lastname: Mathew
authors.forename: Markus
authors.initials: M
authors.lastname: Schwarz
authors.forename: John T
authors.initials: JT
authors.lastname: Doucette
authors.forename: Angelique
authors.initials: A
authors.lastname: Alonso
authors.forename: Katherine A
authors.initials: KA
authors.lastname: Collins
authors.forename: Alexander
authors.initials: A
authors.lastname: Neumeister
authors.forename: Dennis S
authors.initials: DS
authors.lastname: Charney
mesh_terms: D000328:Adult; D003071:Cognition / Q000502:physiology*; D018592:Cross-Over Studies; D003866:Depressive Disorder / Q000503:physiopathology / Q000523:psychology*; D004311:Double-Blind Method; D004644:Emotions / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009483:Neuropsychological Tests; D014364:Tryptophan / Q000097:blood / Q000172:deficiency*
chemical_list: D014364:Tryptophan